FLUME-1105. Allow schema creation without FK constraints in JDBC channel.
Review Request #4667 - Created April 6, 2012 and submitted
Created a configuration option which controls the creation of foreign key constraints for the jdbc channel. The value of this option is true by default, which implies that the FK constraints will be created. To disable these constraints, the user must explicitly turn it off via configuration.
Ran full tests. Also manually verified that the fk constraints could be created or not via the configuration option.